Strange indeed.
Everyone does not believe in lots of things for no good evidence exists, yet for some reason a few people think that a non-belief in God needs to be justified.
I suppose that this could be turned around and we could ask why we need to justify a non-belief in God? Well, it does seem that this is being discussed on this thread, but no one is really making a good case that God is different from any other non-existing entity.
"Religion is the best business to be in. It's the only one where the customers blame themselves for product failure."
-- Ellis Weiner (quoted on the NAiG message board)